High Speed Photography - sledgehammer & malt bottle.
We had a reflectant umbrella with one flash, and another flash was shot through a white umbrella. Universal Photo Timer was used to delay the flash shots by 0.005 of a second, triggered by means of a microphone. Flash power was 1/64 and 1/16.
We discovered that bottles like this don't break easily. A lot of strength was needed to make it break to pieces, as you see here.
Exif: ISO 800 ; f/7.1 ; 2 sec ; @100mm
Flash riggered by sound, 0.005 sec aftec impact
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